Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Fri Jun 12 00:53:44 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger526351
======================================================================

  Trigger: 00526351      Segment: 000

  BAT Trigger Time: 363793356.8   [s; MET]
      Trigger Stop: 363793357.824   [s; MET]
               UTC: 2012-07-12T13:42:27.382260    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 169.60548368771   Dec: -20.0607384702281  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.6
     Image Trigger?:     NO
     Rate S/N Ratio:     20.4694894904587  [ if not an image trigger ]
     Image S/N Ratio:    11.6

  Analysis Position:   [ source = BAT ]
    RA: 169.60548368771   Dec: -20.0607384702281  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 169.598341106773   Dec: -20.0508031513664  [deg; J2000]  
        { 11h 18m 23.6s , -20d 03' 02.9" }
         +/- 0.905939596473807 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.407822071365021 [arcmin] (formal 1-sigma fit error)
    SNR: 35.0271802338161
 
  Angular difference between the analysis and refined position is 0.719318 arcmin
 
  Partial Coding Fraction: 0.5546875    [ including projection effects ]

  Duration
     T90: 14.8079999685287 +/- 3.2362150653343
        Measured from: -2.44800001382828
                   to: 12.3599999547005     [s; relative to TRIGTIME]
     T50: 6.89199995994568 +/- 0.529104881367349
        Measured from: 0.567999958992004
                   to: 7.45999991893768     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 7.50800001621246     
                   to: 8.50800001621246     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.57200002670288     
                   to: 16.527999997139     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.592167   1.027070   0.866299   0.199232
           0.037174   0.039715   0.035552   0.028562 [error]
 Peak      0.057736   0.108833   0.108565   0.023115
           0.008818   0.009842   0.009176   0.007111 [error]

     [ fluence units of on-axis counts / fully illuminated detector ] 

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   21.100   -4.572   16.528
T90    14.808   -2.448   12.360
T50     6.892    0.568    7.460
Peak    1.000    7.508    8.508
 
 
====== Spectral Analysis Summary =====================================
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^{Ph_index}
Ph_90err   : 90% error of the photon index
Epeak      : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm       : normalization at 50 keV in both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedo
 
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -1.364    -0.076      0.076       -           -               -         8.97e-03     -3.89e-04          3.89e-04      62.410   57
CPL     -0.989    -0.295      0.316      144.267     -42.815       290.416      1.35e-02     -3.65e-03          5.39e-03      57.600   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: CPL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -1.146     -0.153     0.156       -           -               -         2.04e-02     -1.95e-03          1.95e-03      67.360   57
CPL     -0.134     -0.678     0.804       99.698     -22.920        88.736      6.13e-02     -3.14e-02          7.89e-02      60.410   56
 
 
=== Fluence/Peak Flux Summary ===
 
              Model    Band1     Band2     Band3     Band4     Band5     Total
                       15-25     25-50    50-100    100-350    15-150    15-350    keV
Fluence         PL   2.13e-07  4.25e-07  6.61e-07  2.26e-06  1.84e-06  3.56e-06   erg/cm2
      90%_error_low -1.72e-08 -2.09e-08 -3.49e-08 -2.54e-07 -8.67e-08 -2.77e-07   erg/cm2
      90%_error_hi   1.77e-08  2.08e-08  3.48e-08  2.75e-07  8.69e-08  2.95e-07   erg/cm2
Peak flux       PL   5.99e-01  7.44e-01  6.73e-01  1.06e+00  2.38e+00  3.07e+00   ph/cm2/s
      90%_error_low -1.05e-01 -8.47e-02 -7.14e-02 -2.13e-01 -2.34e-01 -3.07e-01   ph/cm2/s
      90%_error_hi   1.11e-01  8.39e-02  7.09e-02  2.44e-01  2.35e-01  3.11e-01   ph/cm2/s
 
Fluence        CPL   1.97e-07  4.39e-07  6.82e-07  1.36e-06  1.80e-06  2.68e-06   erg/cm2
      90%_error_low -2.09e-08 -2.37e-08 -3.92e-08 -4.20e-07 -9.38e-08 -4.25e-07   erg/cm2
      90%_error_hi   2.14e-08  2.40e-08  3.97e-08  6.56e-07  9.35e-08  6.50e-07   erg/cm2
Peak flux      CPL   4.79e-01  8.02e-01  7.47e-01  4.33e-01  2.30e+00  2.46e+00   ph/cm2/s
      90%_error_low -1.26e-01 -9.87e-02 -8.82e-02 -1.82e-01 -2.41e-01 -3.08e-01   ph/cm2/s
      90%_error_hi   1.33e-01  1.01e-01  9.05e-02  3.30e-01  2.41e-01  3.83e-01   ph/cm2/s
 
======================================================================
  • Special notes of this burst




    Image

    Pre-slew 15.0-350.0 keV image (Event data)

    #   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
      169.5983   -20.0508   0.0055    31.3215   154.6746         2.6738483     35.027 TRIG_00526351                 
     
    Foreground time interval of the image:
     -4.572  14.901 (delta_t =  19.473 [sec])
    Background time interval of the image:
    -239.800  -4.572 (delta_t = 235.228 [sec])
    




    Light Curves

    Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.

    Full-time range; 1 s binning

    Bokeh Plot

    Other quick-look light curves:




    Spectra

    Notes:

    Time averaged spectrum fit using the average DRM

    Power-law model
    Time interval is from   -4.572 sec. to   16.528 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.36422     ( -0.0762877   0.0764958 )
    Norm@50keV  : 8.97358E-03    ( -0.000389481   0.000389453 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          62.41 using 59 PHA bins.
    # Reduced chi-squared =          1.095 for     57 degrees of freedom 
    # Null hypothesis probability =   2.900982e-01
     
    Photon flux (15-150 keV)    in 21.1 sec: 1.08429 ( -0.04954  0.04962 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.84367e-06 ( -8.66645e-08  8.69333e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from   -4.572 sec. to   16.528 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -0.988894     ( -0.295386   0.315956 )
    Epeak [keV] : 144.267      ( -42.8157 290.416 )
    Norm@50keV  : 1.35311E-02    ( -0.00364922   0.00538972 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          57.60 using 59 PHA bins.
    # Reduced chi-squared =          1.029 for     56 degrees of freedom 
    # Null hypothesis probability =   4.156178e-01
     
    Photon flux (15-150 keV)    in 21.1 sec: 1.06401 ( -0.05189  0.05195 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.80112e-06 ( -9.38482e-08  9.35023e-08 ) ergs/cm2
     
    

    1-s peak spectrum fit

    Power-law model
    Time interval is from    7.508 sec. to    8.508 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.14586     ( -0.153172   0.156256 )
    Norm@50keV  : 2.04087E-02    ( -0.00195164   0.00195081 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          67.36 using 59 PHA bins.
    # Reduced chi-squared =          1.182 for     57 degrees of freedom 
    # Null hypothesis probability =   1.639036e-01
     
    Photon flux (15-150 keV)    in 1 sec: 2.37891 ( -0.23416  0.23465 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 2.10383e-07 ( -2.16751e-08  2.17784e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from    7.508 sec. to    8.508 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -0.133648     ( -0.678354   0.804405 )
    Epeak [keV] : 99.6984      ( -22.9194 88.7358 )
    Norm@50keV  : 6.13118E-02    ( -0.031364   0.0788956 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          60.41 using 59 PHA bins.
    # Reduced chi-squared =          1.079 for     56 degrees of freedom 
    # Null hypothesis probability =   3.196285e-01
     
    Photon flux (15-150 keV)    in 1 sec: 2.29954 ( -0.24109  0.24115 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.9932e-07 ( -2.33778e-08  2.33901e-08 ) ergs/cm2
     
    

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot

    T90                                   = 14.808 sec.
    Hardness ratio (energy fluence ratio) = 1.55378216922
    

    S(15-50 keV) vs. S(50-150 keV) plot

    S(15-50 keV)  = 6.380585e-07
    S(50-150 keV) = 1.2056234e-06
    

    The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.




    Mask shadow pattern

    IMX = -5.500395652468303E-01, IMY = -2.603010638826990E-01
    

    Spacecraft aspect plot

    Bright source in the pre-burst/pre-slew/post-slew images

    Pre-burst image of 15-350 keV band

    Time interval of the image:
    -239.800000 -4.572000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    135.5230 -40.5710   23.6  55.3 -165.4   0.3209   0.5    1.0	Vela X-1                      
    179.2594 -35.6535    2.6  49.0  151.3   3.0364   4.4 ------	UNKNOWN                       
    166.1244 -42.4753    2.4  52.6  166.4   3.6187   4.8 ------	UNKNOWN                       
    125.9360 -38.5098    3.5  57.9 -156.8   3.9294   3.3 ------	UNKNOWN                       
    127.2195  54.8976    3.0  52.0  -31.4   2.2410   3.9 ------	UNKNOWN                       
    

    Pre-slew background subtracted image of 15-350 keV band

    Time interval of the image:
    -4.572000 14.900590
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    135.5215 -40.4889   15.5  55.2 -165.4  -0.1471  -0.7    4.0	Vela X-1                      
    169.5984 -20.0508    0.3  31.3  154.7   2.6734  34.9 ------	UNKNOWN                       
    118.6325  -2.0577    2.0  43.0 -111.9   1.1261   5.7 ------	UNKNOWN                       
    

    Post-slew image of 15-350 keV band

    Time interval of the image:
    74.100600 962.313100
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    135.6112 -40.4126  153.9  35.4 -166.2   0.0243   0.1    9.3	Vela X-1                      
    170.2906 -60.5816    5.2  40.5  146.0   1.4839   2.2    2.6	Cen X-3                       
    186.6506 -62.7696   69.8  44.3  135.4  -0.1845  -0.2    0.2	GX 301-2                      
    128.9995 -43.1839    1.5  41.0 -167.2   3.1447   7.8 ------	UNKNOWN                       
    105.2056 -38.2555    3.8  57.9 -156.8   5.5015   3.0 ------	UNKNOWN